21285904

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{139}}^1\times {\mathrm{563}}^1$

素因数の和:727

約数の個数: 40

約数和(自身を含む): 44059680

約数和(自身を除く): 22773776

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 139, 272, 278, 556, 563, 1112, 1126, 2224, 2252, 2363, 4504, 4726, 9008, 9452, 9571, 18904, 19142, 37808, 38284, 76568, 78257, 153136, 156514, 313028, 626056, 1252112, 1330369, 2660738, 5321476, 10642952, 21285904]

約数ペア:

[(1, 21285904), (2, 10642952), (4, 5321476), (8, 2660738), (16, 1330369), (17, 1252112), (34, 626056), (68, 313028), (136, 156514), (139, 153136), (272, 78257), (278, 76568), (556, 38284), (563, 37808), (1112, 19142), (1126, 18904), (2224, 9571), (2252, 9452), (2363, 9008), (4504, 4726)]